• Korean Management Science Review
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• v.23 no.3
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• pp.243-257
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• 2006

ITU-T's NgN(Next generation Network) architecture is expected to offer a new Internet platforms such as QoS(Quality of Service) guaranteed services as it overcame the limitations of the existing best-effort Internet architecture. However, policy development crucial for the NgN framework(e.g., interconnections and billing) is lagging far behind technology development. For example, arguments over network neutrality clearly indicate little understanding of the Internet industry structure where diverse providers including ISP and CP coexist. This study employs a network economics approach to predict how the competitive landscape involving various providers will evolve under the traffic-based billing system under the NgN environment. Applied is the non-cooperative game theory, in particular, Stackelberg's repeated game in order to build and analyze model for competition among those providers. We also studied possible impacts that CPs would have on the competitive landscape if they have an option to replace ISP: i.e., CDN(Content Delivery Network) provider. Lastly, based on the model analysis and experiments, presented are their implications to policy development and tile future prospect.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.8
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• pp.318-330
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• 2003

The advantages of "VPN over Internet" are cost-effectiveness and flexibility However, the disadvantages are the lack of sufficient QoS mechanism and transmission capacity for high bandwidth service. Given this increasing demand for high bandwidth Internet and QoS assurances in "PN over Internet", IP/GMPLS based control plane combined with a high bandwidth capacity of DWDM optical network is seen as a very favorable approach for the realization of future "OVPN over IP/GMPLS over DWDM" Within OVPN for providing QoS guaranteed multimedia service over the NGOI(Next Generation Optical Internet) based on the "IP/GMPLS over DWDM" concept, differentiated QoS framework is one of the key issues to implement OVPN over DWDM-based NGOI. Keeping in mind that IETF(Internet Engineering Task Force) and ITU-T(International Telecommunication Union) are standardizing IP/GMPLS over DWDM protocol framework as a solution for the NGOI, in this paper, we suggest Optical-LSP establishment and QoS maintenance scheme based on DOQS(Differentiated Optical QoS Service) classes, which are the key issue of DOQS protocol framework for assuring end-to-end QoS in "OVPN over IP/GMPLS over DWDM".

• The Journal of Korean Physical Therapy
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• v.11 no.1
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• pp.157-165
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• 1999

The Internet is an important tool in contemporary society. This study was carried out to investigate current use of internet and to suggest effective development of it in the field of physical therapy. A sample of physical therapy members in the internet responded to the questionare by means of e-mail from 26, April to 14. May. 1999. Of the 98 subjects, 26 completed the questionnaire, a response rate of $26.53\%$. The results were as follows. The most important problem to use internet in the field of physical therapy was poor information and abscence of database. The exchange of information among members, search database, virtual lecture system and distance treatment counseling in the future were expected. All members, professors of university and college, physical therapists in clinic and students must cooperate to construct database and useful information.

• Journal of KIISE
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• v.42 no.11
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• pp.1423-1429
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• 2015

The Internet of Things (IoT) is a new concept associated with the future Internet, and it has recently become a popular concept to build a dynamic, global network infrastructure. However, the deployment of IoT creates difficulties in satisfying different Quality of Service (QoS) requirements and achieving rapid service composition and deployment. In this paper, we propose a new QoS control scheme for IoT systems. The Markov game model is applied in our proposed scheme to effectively allocate IoT resources while maximizing system performance. The results of our study are validated by running a simulation to prove that the proposed scheme can promptly evaluate current IoT situations and select the best action. Thus, our scheme approximates the optimum system performance.

• Survey Research
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• v.3 no.2
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• pp.17-45
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• 2002

The purpose of this study is to examine the effect of the Flow experience on purchase intention. The results of this study show that (1) the purchase intention through internet is increased in proportion to the degree of cognition of users' experience. (2) The "Flow" experiences during the time of navigating internet shopping-mall sites lead to different results due to the separate motive of searching internet shopping-mall sites. (3) It should analyze the market segmentation of internet users, using Flow experience in the future based on the relationship between Flow and on-line and off-line purchase intention. (4) Finally, it should study more profoundly on "experiential" Flow and "goal-directed Flow that it has to analyze the difference in Flow experiences between separate purposes of searching internet shopping-mall sites.

• Journal of Information Technology Services
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• v.7 no.2
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• pp.197-221
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• 2008

This study is to identify quality factors having influence upon mobile internet service performance theoretically, derive the research model and the hypotheses concerning the cause and effect relationship between these factors and service performance and then analyze them empirically. In order to enhance the model's explanation power, trust and cognitive engagement as interviewing variables are included in the model. The theoretical background of this study was brought from relevant literature in the areas of the theory of reasoned action(TRA). technology acceptance model(TAM), product selection model, cognitive absorption theory and etc. The research model and hypotheses were statistically investigated and analysed through convergent and discriminant validity test, reliability test, and path analyses by means of statistical packages SPSS(12.0) and LISREL(8.72). For these empirical analyses. data were collected through the field survey of 373 users who were willing to continuously use the mobile internet services. Based on the results of the analyses, theoretical and practical significance and future study direction were suggested. The results of this study will be helpful to giving a guideline to companies such as mobile telecom, mobile contents provider and mobile handset manufactures when they have to establish the mobile Internet service marketing strategies.

• Perspectives in Nursing Science
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• v.15 no.2
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• pp.70-80
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• 2018

Purpose: The aim of this study was to investigate the characteristics of intervention programs for internet/smartphone addiction among adolescents through an integrative literature review. Methods: We searched MEDLINE(PubMed), CINAHL, Embase, DBpia, RISS, and KISS using a combination of "Internet or $phone^*$," "$addicti^*$," "adolescent," and "intervention or program or therapy." The searched studies were reviewed according to the criteria and an integrative literature review was conducted on the 14 selected papers published from January 1, 2013 to November 14, 2017. Results: Through the integrative review and analysis, a total of four attributes of interventions and their effects were derived. First, the number of group-focused interventions was significantly higher than that of individual-focused ones. Second, the interventions addressed various aspects of adolescents' problems while considering the complex nature of addiction problems. Third, there was a bias for region and sexual ratio. Lastly, most studies were actively conducted in community-based counseling or psychology settings. Conclusion: It is necessary to find more effective methods for addressing internet/smartphone addiction among adolescents through multidisciplinary approaches, including the consideration of various cultural and gender characteristics. This study provides a basis for developing future programs addressing addiction problems among adolescents.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.2 no.1
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• pp.101-108
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• 1998

Recently, growing Internet traffic have come to mandate the speed-up of Internet links. Also, emerging real-time services generally require QoS (Quality of Service) guarantees in networks. ATM is considered to be the most promising subnetwork technology to meet these requirements efficiently. In this paper, we first analyze recent protocol standardization activities in IETF and ATM Forum for integrating Internet with ATM. This includes brief reviews of protocols such as IETF's IP/ATM, NHRP, RSVP and IS/ATM, as well as ATM Forum's LAN Emulation and MPOA. We then identify two types of integration methodologies, and suggest a classification of the integration. Our work might be helpful to outlook better the future direction of standardization in this field.

• Journal of Agricultural Extension & Community Development
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• v.28 no.1
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• pp.25-39
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• 2021

This study aims to identify the causation effect between technostress and utilization of Internet information and meditation effect of information service acceptability between technostress and Internet information utilization. The data were collected from 503 woman farmers aged 20 to 65 across the country. The analysis performed a three-stage mediated regression of Bron, & Kenny (1986), using the SPSS 21.0 statistical package. The importance of accepting information services has been identified in the Sobel test. According to the analysis of the medium effect on information service acceptability, information service acceptability has a partial medium effect on the technological stress of woman farmers and the level of Internet information utilization. In order to lower the technology of woman farmers in the future, it is necessary to find ways to improve new perceptions of information technology and increase acceptability of information services.

• International Journal of Computer Science & Network Security
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• v.21 no.1
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• pp.107-118
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• 2021

The term Internet of Things (IoTs) refers to the future where things are known daily through the Internet, whether in one way or another, as it is done by the method of collecting various information from various sensors to form a huge network through which people, things and machines are helped to make a link between them at all time and anywhere. The IoTs is everywhere around us such as connected appliances, smart homes security systems and wearable health monitors. However, the question is what if there is a malfunction or outside interference that affects the work of these IoTs based devises? This is the reason of the spread of security causes great concern with the widespread availability of the Internet and Internet devices that are subject to many attacks. Since there aren't many studies that combines requirements, mechanisms, and the attacks of the IoTs, this paper which explores recent published studies between 2017 and 2020 considering different security approaches of protection related to the authentication, integrity, availability and confidentiality Additionally, the paper addresses the different types of attacks in IoTs. We have also addressed the different approaches aim to prevention mechanisms according to several researchers' conclusions and recommendations.